Stalinist series IXmodS-31 Received the Order of the Red Banner
21/Sept/42 missed with torpedoes the tug Perovolyka but the torpedoes exploded on the beach, killing 5 German soldiers.
9/Dec/43 sunk German landing craft F-580 (155 BRT) torpedo.
Only 1 survived. 20 tons of ammunition cause explosion of craft.S-32(lost 26 Jun 1942 German air attack )S-33 Received the Guards Badge
20/Apr/43 sunk Romanian merchant Suceava(6876 GRT) torpedo.
At the time of the sinking, it was 1/4 of the Axis merchant tonnage in Black Sea.

Suceava (on background)

12/May/44 sunk German landing craftF-130 gunfire. (155 GTR).

The unit was sunk and was captured an intact Kriegsmarine flag. S-34(lost between 12/13 Nov 1941 mine)S-35

Leninist series IIL-4 the best soviet submarine of Black Sea with 9 victories, received Order of Red Banner
15/Sept/41 sunk Bulgarian merchant Chipka (2304 GRT) mine. Cargo of grain.
10/Oct/41 sunk the Romanian mine-layer Regele
Carol I (2369 GRT) mine. This mine-layer can be the biggest
enemy warship sunk in Black Sea by submarines.

Romanian
heavy minelayer Regele Carol I sunk after being hit by a mine of submarine L-4.
The ship was an ex-armored cruiser converted into a big minelayer, probably
the largest and most important military ship sunk by a Soviet submarine (also
for the strategic consequences, reducing the enemy mine-laying power).

Немецкий танкер Фредерик поврежден торпедой советской подводной лодки Л-4.
German tanker Friederike's damage after the L-4's torpedo attack. The end was near for
the Axis forces and the ship was not repaired. The
loss was severe for the enemy: the ship could have carried up to 10,000 troops from the evacuation operations.

L-5
17/Feb/43 it’s possible that German landing craft F-473 (155 GRT) was was badly damaged (not recovered) on submarines’
field of mines (probably could have been another mine).